Michael O'Neill, LCSW
NPI 1225431349 · Clinical Social Worker · Greenbrae, CA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael O'Neill, LCSW is a Clinical Social Worker provider in Greenbrae, CA (NPI 1225431349).
Provider details
- NPI number
- 1225431349
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- 130166 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
11 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-10-02
- Last updated
- 2025-08-04
- Certified
- 2025-08-04
Frequently asked questions
- What is Michael O'Neill's NPI number?
- Michael O'Neill's National Provider Identifier (NPI) is 1225431349, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael O'Neill's specialty?
- Michael O'Neill is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Michael O'Neill located?
- Michael O'Neill's practice location on file with NPPES is 250 Bon Air Rd Unit B, Greenbrae, CA 94904-1702.
- What is Michael O'Neill's phone number?
- The practice phone number listed in the NPPES registry for Michael O'Neill is (415) 473-6829.
- Does Michael O'Neill accept Medicare?
- Michael O'Neill is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael O'Neill's NPI active?
- Yes — Michael O'Neill's NPI (1225431349) is active in the NPPES registry as of the last update on 2025-08-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.